#gear_wheel__gear__cogwheel  a toothed wheel that engages another toothed mechanism in order to change the speed or direction of transmitted motion
  supertype:  #wheel  a simple machine consisting of a circular frame with spokes (or a solid disc) that can rotate on a shaft or axle (as in vehicles or other machines)
  subtype:  #bevel_gear  #escape_wheel  #pinion  #planetary_gear  #rack_and_pinion  #spur_gear  #sun_gear  #worm_gear  #worm_wheel
  part:  #cog__sprocket  tooth on the rim of gear wheel
  part:  #tooth_projection_on_a_gear__tooth  one of a number of uniform projections on a gear

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